Revert r1628 which causes the crash of voe_auto_test.

With r1628, it's possible the second memcpy got a NULL nearendClean.

TBR=bjornv
Review URL: https://webrtc-codereview.appspot.com/390005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1643 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/audio_processing/aecm/echo_control_mobile.c

@@ -337,10 +337,10 @@ WebRtc_Word32 WebRtcAecm_Process(void *aecmInst, const WebRtc_Word16 *nearendNoi
 
     if (aecm->ECstartup)
     {
-        if ((nearendClean == NULL) && (nearendNoisy != out))
+        if (nearendClean == NULL)
         {
             memcpy(out, nearendNoisy, sizeof(short) * nrOfSamples);
-        } else if (nearendClean != out)
+        } else
         {
             memcpy(out, nearendClean, sizeof(short) * nrOfSamples);
         }